Rebreather World - View Single Post - using lungs to mix OC deco gas on the fly?

UKSteve · 26th March 2007, 08:13

Mike,

Interesting...and tricky too in a human lung I guess...with tidal volumes etc.

But how about a similar approach but using one counterlung? If you have a second manual injector on your "upstream" counter lung then you might be able to add relative volumes of each gas with one or more squirts of O2 and dil into the bag before breathing off it? Could even massage a front mounted lung a little to mix it before breathing it. If at deco / rest then your RMV is ging to be lower - esp at high ppO2s - and so would be time to mix a couple of breaths at a time.

Should be possible to come up with a sort of table for this for different mixes and different depths if we assume that a 1 sec squirt will add a predictable relative volume of each gas.

As someone once said...any gas is a lot better to breath than water...

Steve

26th March 2007, 08:13	#7 (permalink)
UKSteve Steve Collard Current Rebreather/s: Inspiration Vision Other Rebreather/s: Join Date: Jul 2005 Location: Weymouth, UK Posts: 598	Re: using lungs to mix OC deco gas on the fly? Mike, Interesting...and tricky too in a human lung I guess...with tidal volumes etc. But how about a similar approach but using one counterlung? If you have a second manual injector on your "upstream" counter lung then you might be able to add relative volumes of each gas with one or more squirts of O2 and dil into the bag before breathing off it? Could even massage a front mounted lung a little to mix it before breathing it. If at deco / rest then your RMV is ging to be lower - esp at high ppO2s - and so would be time to mix a couple of breaths at a time. Should be possible to come up with a sort of table for this for different mixes and different depths if we assume that a 1 sec squirt will add a predictable relative volume of each gas. As someone once said...any gas is a lot better to breath than water... Steve
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